When I study mathematics, I just do it leisurely and at my own pace. Over the course of my whole mathematics education, I've enjoyed learning the abstract ideas/concept in it, the problem is I'm a bit clumsy doing calculations. I can study and do proofs/concepts but practicing problem sets eats my focus big time and I get tired doing it. Now, I can enjoy reading and learning as much math as I want but I really need to brush up with my calculation/problem solving skills, as I'd rather have good grades in college (I tend to solve really slow) at the same time. The question is just how much practice is enough?